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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 22,653	$ 21,950	$ 22,673	$ 22,201
Other comprehensive income (loss) before reclassifications	56	41	(272)	537
Amounts reclassified to the Consolidated Statements of Operations	(26)	(32)	(49)	(32)
Total other comprehensive income (loss), net of income taxes	30	9	(321)	505
Ending balance	23,199	22,418	23,199	22,418
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(411)	85	(60)	(411)
Total other comprehensive income (loss), net of income taxes	30	9	(321)	505
Ending balance	(381)	94	(381)	94
Net Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(57)	96	(11)	3
Other comprehensive income (loss) before reclassifications	46	(8)	25	88
Amounts reclassified to the Consolidated Statements of Operations	(27)	(34)	(52)	(37)
Total other comprehensive income (loss), net of income taxes	19	(42)	(27)	51
Ending balance	(38)	54	(38)	54
Net Unrealized Gains (Losses) on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	71	401	380	1
Other comprehensive income (loss) before reclassifications	10	49	(297)	449
Amounts reclassified to the Consolidated Statements of Operations	(3)	(2)	(5)	(2)
Total other comprehensive income (loss), net of income taxes	7	47	(302)	447
Ending balance	78	448	78	448
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(425)	(412)	(429)	(415)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified to the Consolidated Statements of Operations	4	4	8	7
Total other comprehensive income (loss), net of income taxes	4	4	8	7
Ending balance	$ (421)	$ (408)	$ (421)	(408)
Cumulative Effect, Period Of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				$ (331)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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